Sadie's teacher, Ms Stoneman, checked Sadie's blood sugar levels and reported back to her mum that they were fine.

However half an hour later they dropped dramatically from 122 to 82, nearing a "danger zone" for Sadie.

"I’ll be honest, it kinda blew my mind," Stoneman said.

Hero is able to detect changes to Sadie's blood sugar levels through an odour omitted by the body when chemical changes occur.

When her blood sugar levels are too low, Hero whines and will offer her parents his left paw.

Hero's trainer, KC Owens from Tattle Tale Scent Dogs, said she "couldn't explain" how the dog was able to sense it from so far away, but theorised the dog could have an instinct similar to a mother's intuition.

Diabetes Facts

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What Is Type 1 Diabetes?

Commonly referred to as Juvenile Diabetes, because it’s often diagnosed in childhood. However, it can also be diagnosed in adults. Type 1 diabetics have a pancreas that produces little or no insulin, which requires insulin management through medication that is usually injected.